I am using the GEF4 integration site to get my target definition, and update it regularly to pick up changes. At some point in the last few weeks, I started getting these warning messages:

*** WARNING: The actual type of adapter org.eclipse.gef4.mvc.fx.parts.FXRootPart@3cb68736 could not be inferred from the binding at org.eclipse.gef4.mvc.fx.MvcFxModule.bindFXRootPartAsContentViewerAdapter(MvcFxModule.java:654). The adapter will only be retrievable via key types assignable to org.eclipse.gef4.mvc.fx.parts.FXRootPart, which is the actual type inferred from the instance.
You should probably adjust your binding to provide a type key using AdapterKey.get(<type>).
*** WARNING: The actual type of adapter org.eclipse.gef4.mvc.models.FocusModel@3267173d could not be inferred from the binding at org.eclipse.gef4.mvc.fx.MvcFxModule.bindFocusModelAsContentViewerAdapter(MvcFxModule.java:339). Therefore, the given type key org.eclipse.gef4.mvc.models.FocusModel<javafx.scene.Node> can not be confirmed.
Make sure the provided type key org.eclipse.gef4.mvc.models.FocusModel<javafx.scene.Node> matches to the actual type of the adapter.
*** WARNING: The actual type of adapter org.eclipse.gef4.mvc.models.HoverModel@2b393e89 could not be inferred from the binding at org.eclipse.gef4.mvc.fx.MvcFxModule.bindHoverModelAsContentViewerAdapter(MvcFxModule.java:884). Therefore, the given type key org.eclipse.gef4.mvc.models.HoverModel<javafx.scene.Node> can not be confirmed.
Make sure the provided type key org.eclipse.gef4.mvc.models.HoverModel<javafx.scene.Node> matches to the actual type of the adapter.
*** WARNING: The actual type of adapter org.eclipse.gef4.mvc.models.SelectionModel@11f470a7 could not be inferred from the binding at org.eclipse.gef4.mvc.fx.MvcFxModule.bindSelectionModelAsContentViewerAdapter(MvcFxModule.java:1005). Therefore, the given type key org.eclipse.gef4.mvc.models.SelectionModel<javafx.scene.Node> can not be confirmed.
Make sure the provided type key org.eclipse.gef4.mvc.models.SelectionModel<javafx.scene.Node> matches to the actual type of the adapter.

This is in a viewer part, which doesn't need any specific behaviour, so it is just using the standard MvxFxModule for the bindings. All of the bindings being warned about are from that module. Is this something to be concerned about?

these warnings indicate that the type key that is specified in the adapter map bindings of the respective adapters cannot be confirmed because the adapter type could not be inferred from the binding. I have added respective warnings when enabling role-based adapter injection (see https://bugs.eclipse.org/bugs/show_bug.cgi?id=481677). As long as the type key matches the actual type of the adapter (as is the case here), these warnings may simple be ignored.